Cover plate for sewing machines



Dec. 1, 1931 c. w. MUELLER Filed Aug. 31, 1929 2 Sheets-Sheet l Dec. 1,1931. c. w. MUELLER 1,834,633

COVER .PLATE FOR SEWING MACHINES Filed Aug. 31, 1929 '2 Sheets-Sheet 2 3nventor,

stitch sewing machine such as is disclosed'in Patented Dec. 1, 1931 UNITED. STATES PA EN oFF 'cr.

CHARLES w. MUELLER, or s'n oUIS, MISSOURI, 'AssIG oR T0 LEwIs INVISIBLE STITCH MACHINE COMPANY, on ST. LOUIS, MISSOURI, A'CORPORATION OFMAINE COVER PLATE roe SEWINGMACHINES Application filed l'iugust 31,,1929. Serial No. 389,803. i

This invention relates to new and useful improvements in cover plates for sewing machines, and particularly for use in connection with the forwardly extending arm of a blind my Patent 1,739,081, Dec. 10, 1929.

In machines ofthe above type, the loope'r mechanism and the top feed mechanism extend along the lower part of the forwardly extending arm and inasmuch'as it is desirable to have access to these parts, it is necessary that a removable cover plate be provided and inasmuch as thiscover plate must be supported from the arm, it isdesirable to provide means which will not only maintain the arm in operative position but which will also permit of the cover plate being readily removed or replaced whenever desired.

It is therefore the main object of my present invention to provide a cover plate for a forwardly extending arm of a sewing machine, and connections between the arm and the cover plate which will permit the latter to be removed or replaced whenever desired and which, when the cover plate is in operative position, will securely retain the latter against accidental displacement.

Vith these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illus trated in the accompanying drawings.

In the accompanying drawings:

Figure 1 shows a sewing machine equipped with a cover plate embodying my invention,

Figure 2 is a cross-sectional view taken on the line 2-2 of Figure 1, and

Figure 3 is a perspective view of the cover plate.

Like reference numerals designate corresponding parts throughout the several figures of the drawings.

Referring to the accompanying drawings, the sewing machine to which my invention is applied includes a base 5, a work arm 6, a standard 7 from the upper end of which projects an arm 8, and a needle arm 9 which extends forwardly from the arm 8 and terminates directly above the free end of the provided with into this opening work arm 6. In the needlearm 9 is a needle operating shaft 10 and the mechanisms for operating the top feed 11 and the looper 12, the shaft 10 only being disclosed.

normally exposes the mechanisms therein, and includes a top wall 13 and spaced side walls 14 and 15 which are relatively short and tall.

tively long wall 15 is provided horizontal edge 15*. In order .to cover with a lower the mechanisms within the arm 9, I have provided a cover plate A V which is formed from a single casting and includes a bottom 17, a relatively tall side wall 18 having an" upper horizontal edge 18,

a rear end wall 19, and a relatively short side Wall 20 having an upper horizontal edge 20.

The upper edges of the walls 18 and 20 are adapted toabut the lower edges ofthe side The arm 9 which is of'shell like formation walls 14 and 15, as shown particularly in Figure 2. The arm 9 is provided with Spaced and integral lugs or stops 16'16 which are located betweenthe walls 14-and 15 adjacent the wall it and project downwardly therebelow. The side wall 18 is provided with a recess 21 which extends downwardly from the upper edge thereof and is located between the stops 16-16when the cover plate is in operative position. The wall 15 of the arm 9 is a threaded opening 22 which is located opposite the recess 21, and threaded 22 is a tubular housing 23. This housing is disposed within the arm 9 and extends transversely thereof, the inner end 24 of the housing being provided with an opening 25. A clamping bolt 26 has a reduced end 27 which slides in the opening 25. The. free end of the reduced end 27 extends beyond the wall 15 and has a sleeve 28 secured thereto by a pin 29, the outer endofthe sleeve being provided with a head 30. The

I inner end of the sleeve 28 is spaceda considerable distance from the inner end 24 of the the cover plate,: and a spring mally urge the clamping bolt toward the right as viewed in Figure 2. Thus the opening 25 and the sleeve 28 cooperate with the bolt and housing to form bearings for said bolt. Rigidly connected to the end of the bolt 26 opposite the reduced portion 27 thereof is a'stop or head 32 which engages the outer face of the wall 18 and thereby frictionally retains the cover plate against accidental displacement, the bolt functioning to clamp the wall 18 between the stops 1616 and the bolt head 32.

When it is desired to remove the cover plate, pressure on the head 30 will shift the locking bolt 26 longitudinally toward the left and thereby release the head 32 from said cover plate so-as, to permit the latter to be readily removed. hen it is desired to re place the cover plate, thelocking bolt 26 is again pushed toward the left as viewed in Figure 2, thecover plate is positioned with the recess 21 in registration with the bolt 26, and the locking bolt is then released.

It is of course to be understood that the details of structure and arrangements of parts may be variously changed and modified without departing from the spirit and scope of my invention.

Iclaim: p i

'1. The combination of a sewing machine including a needle-arm having normally exposed operating mechanism therein, said arm including a top and side walls, a cover plate for said operating mechanism disposed below and abutting the lower edges of said side walls, a transversely disposed clamping bolt mounted onone of said walls for engagement with said cover plate, and a spring for normally holding said bolt in frictional contact with said coverplate. i Y

2. The combination of a sewing machine including a needle-arm having normally exposed operating mechanism therein, said arm including a top and side walls, a cover plate with spaced and downwardly extending stops, the tall side wall being provided with an opening opposite said stops, a cover plate for said operating mechanism disposed below and abutting the lower edges of said side walls, said plate including a bottom and an'upwardly extending wall having a downwardly extending recess arranged intermediate said stops a tubular housing extending transversely of the arm and having its outer ends secured in the opening of the tall wall, a clamping bolt mounted in said housing and extending through the recess in said cover plate and provided with a clamping head engageable with the plate on opposite sides of the recess, and a spring within the housing for urging the bolt in a direction to clamp the cover plate between the bolt head and,

the spaced stops.

In testimony whereof I hereunto afiix my signature.

' CHARLES W. MUELLER for said operating mechanism disposed be- 7 low and abutting the lower edges of said side walls, said plate including a bottom and an upwardly extending wall havinga' downwardly extendingrecess, a transversely disposed: clamping bolt mounted on one of said walls and extending through said recess of r for normally holding saidflbolt in frictional contact with said cover plate. 7

3. The combination ofa sewing machine including a needle-arm having normally exincluding a top and relatively short andtall side walls, the short side wall being provided lwith spaced and downwardly extending a bottom and an upwardly extending wall 7 having a downwardly extending recess ar- .p0sed operating mechanism therein, said arm c 

